/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraSystemSimulation.h
[TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraSystemInstance](API\Plugins\Niagara\FNiagaraSystemInstance) * > & GetSystemInstances ( [ENiagaraSystemInstanceState](API\Plugins\Niagara\ENiagaraSystemInstanceState) State )